Either your doctor or Public Health (free) can check you for giardia lamblia. It is done with a feces sample. If you had it while pregnant it should have been treated even though you were pregnant. When gone untreated it's side effects can be permenant and very damaging. I lost all ability to eat food and suffer from severe abdominal pain. If you have this you need treatment immediately! Please take the simple free test as soon as possible. If you really had it, it should not have gone away on it's own. I am surprised Public Health did not send out a social worker to you. Here in Champaign, Illinois, if giardia lamblia is discovered everyone in the household must be tested by law. Since the disease is connected to water supply - something like a bad well would have to be quarentined. Please do not delay in getting tested and cured. The damage this parasite can cause is usually permenant and untreatable. Get it out of you now.
Some people can develop long-term infections if they're not treated. You may want to consider getting checked.